EX9208 Switch Hardware Overview

Juniper Networks EX9208 Ethernet Switches provide high performance, scalable connectivity, and carrier-class reliability for high-density environments such as campus-aggregation and data-center networks. The EX9208 switch has a throughput of up to 4.8 terabits per second (Tbps) or up to 240 gigabits per second (Gbps) per slot full duplex. The EX9208 switch is a modular system that provides high availability and redundancy for all major hardware components, including Routing Engine modules (RE modules), Switch Fabric modules (SF modules), fan tray (redundant fans), and power supplies.

You can manage EX9208 switches by using the same interfaces that you use for managing other devices running the Juniper Networks Junos operating system (Junos OS)—the CLI, the Network and Security Manager (NSM), and Junos Space.

• Software
• Chassis Physical Specifications
• Host Subsystem
• Line Cards
• Cooling System
• Power Supplies

Software

Juniper Networks EX Series Ethernet Switches run Junos OS, which provides Layer 2 and Layer 3 switching, routing, and security services.

Chassis Physical Specifications

The EX9208 switch is eight rack units (8 U) in size. Five EX9208 switches can fit in a standard 48 U rack. Each EX9208 switch is designed to optimize rack space and cabling. See Figure 10, Figure 11, and Figure 12.

Figure 10: Front View of an EX9208 Switch

Figure 11: Rear View of an EX9208 Switch with AC Power Supplies

Figure 12: Rear View of an EX9208 Switch with DC Power Supplies

Host Subsystem

Switching and routing functionality, system management, and system control functions of an EX9208 switch are performed by the host subsystem. The host subsystem consists of a Routing Engine functioning together with a Switch Fabric.

You can install either one or two host subsystems in the slots labeled 0 and 1 in the front panel of the chassis. A base-configuration EX9208 switch has one host subsystem. A redundant-configuration EX9208 switch has a second host subsystem. For more information, see EX9208 Switch Configurations.

Line Cards

The EX9208 switch has six horizontal line card slots and supports line rate for each line card. The line cards in EX9208 switches combine a Packet Forwarding Engine and Ethernet interfaces in a single assembly. Line cards are field-replaceable units (FRUs) that you can install in the line card slots—labeled 0 through 5—on the front of the switch chassis. All line cards are hot-removable and hot-insertable. Table 19 lists the line cards available for EX9208 switches.

Cooling System

The cooling system in an EX9208 switch is a field-replaceable unit (FRU). It consists of a hot-removable and hot-insertable fan tray. The fan tray contains six fans. The fan tray installs vertically on the right back of the chassis and provides side-to-side chassis cooling. See Cooling System and Airflow in an EX9208 Switch.

Power Supplies

Power supplies for the EX9208 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. Each EX9208 switch chassis can hold up to four AC or DC power supplies.

Table 20 shows the details of the power supplies available for EX9208 switches.

A base-configuration EX9208 switch ships with three low-line (100–120 VAC) or two high-line (200–240 VAC) AC power supplies. An AC-powered, redundant-configuration EX9208 switch ships with four low-line (100–120 VAC) or four high-line (200–240 VAC) AC power supplies. See AC Power Supply in an EX9208 Switch.

A DC-powered, redundant-configuration EX9208 switch ships with four DC power supplies. See DC Power Supply in an EX9208 Switch.

Caution: Do not mix AC and DC power supplies in the same chassis.

Related Documentation

• Connecting and Configuring an EX9200 Switch (CLI Procedure)
• Field-Replaceable Units in an EX9200 Switch
• Line Card Model and Version Compatibility in an EX9200 Switch